The Stefan Walls Class Battlecruiser is an old but still reliable design dating back to the days of the Dilgar War. The Stefan Walls was one of the most advanced battlecruiser classes in use by the Earth Alliance at the time, and though there are many designs that are more powerful now, all vessels of this class that survived the Earth-Minbari War as well as the Earth Civil War are now in the possession of Mars Guard after Earth retired the design.

*side note* this is a gift for my dear friend  straitfox who likes Babylon 5 as well.